A ball drops some distance and gains 30 J of kinetic energy. Do not ignore air resistance. How much gravitational potential energy did the ball lose?
A) more than 30 J
B) exactly 30 J
C) less than 30 J
D) Cannot be determined from the information given.
A
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What is a rotation curve?
A) a graph showing how orbital velocity depends on distance from the center for a spiral galaxy B) a precise description of the shape of a star's orbit around the center of the Milky Way Galaxy C) a curve used to decide whether a star's orbit places it in the disk or the halo of a spiral galaxy D) a graph that shows a galaxy's mass on the vertical axis and size on the horizontal axis
An aluminum wire 2.0 m long and 2.0 mm in diameter supports a 10.0-kg fixture. What is the stress in the wire? Young's modulus for aluminum is 7.0 × 1010 N/m2
A) 9.3 × 107 N/m2 B) 3.1 × 107 N/m2 C) 6.2 × 107 N/m2 D) 1.2 × 108 N/m2
There is a permanent dark side of the Moon.
Answer the following statement true (T) or false (F)
When a skateboarder pushes on a wall,
A) an interaction occurs between the skateboarder and the wall. B) the wall pushes on the skateboarder. C) such a push couldn't happen unless the wall pushed on the skateboarder. D) all the above E) none of the above